US4162045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ore grinding process
Assignee: Dow Chemical Co
•
Filing: 1978-08-11
•
Granted: 1979-07-24
•
Expires: 1998-08-11
Abstract
Abstract A process for grinding coal or ores containing metal values comprising carrying out said grinding in a liquid medium and with a grinding aid system comprising an anionic polyelectrolyte derived from polyacrylic acid and certain inorganic metal salts, said system being dispersible in the liquid medium and being present in an amount effective to provide increased grinding efficiency.
Inventors
- 👤 Melvin F. Katzer
- 👤 Richard R. Klimpel
- 👤 Willy Manfroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:10
CPC Classifications
B; B02; B02C; B02C23/00; B02C23/06
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
89 words
A process for grinding ores containing metal values or coal, which comprises carrying out said grinding in the presence of a liquid medium and a grinding aid system comprising (a) a polyelectrolyte comprising acrylic or methacrylic acid polymers or copolymers of the same together or with other ethylenically unsaturated monomers, and (b) an inorganic compound selected from the group consisting of alkali metal salts of carbonates and bicarbonates, said grinding aid system being dispersible in said medium and being employed in an amount effective to synergistically increase grinding efficiency.
Claim 2
Dependent Claim
89 words
A process for grinding ores containing metal values or coal, which comprises carrying out said grinding in the presence of a liquid medium and a grinding aid system comprising (a) a polyelectrolyte comprising acrylic or methacrylic acid polymers or copolymers of the same together or with other ethylenically unsaturated monomers, and (b) an inorganic compound selected from the group consisting of alkali metal salts of carbonates and bicarbonates, said grinding aid system being dispersible in said medium and being employed in an amount effective to synergistically increase grinding efficiency.
Claim 3
Dependent Claim
14 words
The process of claim 1 wherein the polyelectrolyte is a homopolymer of acrylic acid.
Claim 4
Dependent Claim
14 words
The process of claim 1 wherein the polyelectrolyte is a homopolymer of methacrylic acid.
Claim 5
Dependent Claim
19 words
The process of claim 1 wherein the polyelectrolyte comprises a copolymer of acrylic acid with an ethylenically unsaturated monomer.
Claim 6
Dependent Claim
19 words
The process of claim 1 wherein the polyelectrolyte comprises a copolymer of methacrylic acid with an ethylenically unsaturated monomer.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein ores containing metal values are ground.
Claim 8
Dependent Claim
9 words
The process of claim 1 wherein coal is ground.
Claim 9
Dependent Claim
25 words
The process of claim 6 wherein the grinding aid system comprises (a) a homopolymer of acrylic acid and (b) an alkali metal carbonate or bicarbonate.
Claim 10
Dependent Claim
21 words
The process of claim 6 wherein the grinding aid system is a homopolymer of acrylic acid and an alkali metal silicate.
Claim 11
Dependent Claim
99 words
A process for grinding ores containing metal values or coal, which comprises carrying out said grinding in the presence of a liquid medium and a grinding aid system comprising (a) salts of a polyelectrolyte comprising acrylic or methacrylic acid polymers or copolymers of the same together or with other ethylenically unsaturated monomers, and (b) an inorganic compound selected from the group consisting of alkali metal salts of carbonates, bicarbonates and silicates or ammonium salts of carbonates and bicarbonates, said grinding aid system being dispersible in said medium and being employed in an amount effective to synergistically increase grinding efficiency.
Claim 12
Dependent Claim
99 words
A process for grinding ores containing metal values or coal, which comprises carrying out said grinding in the presence of a liquid medium and a grinding aid system comprising (a) salts of a polyelectrolyte comprising acrylic or methacrylic acid polymers or copolymers of the same together or with other ethylenically unsaturated monomers, and (b) an inorganic compound selected from the group consisting of alkali metal salts of carbonates, bicarbonates and silicates or ammonium salts of carbonates and bicarbonates, said grinding aid system being dispersible in said medium and being employed in an amount effective to synergistically increase grinding efficiency.
Claim 13
Dependent Claim
16 words
The process of claim 10 wherein the polyelectrolyte is a salt of an acrylic acid homopolymer.
Claim 14
Dependent Claim
16 words
The process of claim 10 wherein the polyelectrolyte is a salt of a methacrylic acid homopolymer.
Claim 15
Dependent Claim
15 words
The process of claim 2 wherein the salt is an alkali metal or ammonium salt.
Claim 16
Dependent Claim
15 words
The process of claim 12 wherein the salt is an alkali metal or ammonium salt.
Claim 17
Dependent Claim
11 words
The process of claim 10 wherein the polyelectrolyte is sodium acrylate.
Claim 18
Dependent Claim
11 words
The process of claim 10 wherein the polyelectrolyte is sodium methacrylate.
Claim 19
Dependent Claim
19 words
The process of claim 10 wherein the polyelectrolyte comprises a copolymer of acrylic acid with an ethylenically unsaturated monomer.
Claim 20
Dependent Claim
19 words
The process of claim 10 wherein the polyelectrolyte comprises a copolymer of methacrylic acid with an ethylenically unsaturated monomer.
Claim 21
Dependent Claim
12 words
The process of claim 15 wherein the inorganic compound is sodium carbonate.
Claim 22
Dependent Claim
12 words
The process of claim 16 wherein the inorganic compound is sodium carbonate.
Claim 23
Dependent Claim
9 words
The process of claim 10 wherein coal is ground.
Claim 24
Dependent Claim
12 words
The process of claim 10 wherein ores containing metal values are ground.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-23 | 1983-01-22 | 1983-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-23 | 1987-01-22 | 1987-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-23 | 1991-01-22 | 1991-07-24 | $7700.00 | Window Closed / Lapsed |